Telephone system



R. C. M. HASHNGS. TELEPHONE SYSTEM.

I APPLICATION FILED DEC. 21, I917. Relssued Apr. 27, 1920.

4 SHEETS-SHEET l- 1mm 12. tfjyfiaslilys' M Rfc. M. HASTINGS.

- TELEPHONE SYSTEM. 7

APPLICATION FILED DEC. 27, I917- Relssued Apr. 27,1920. I I 14,848.

4 SHEETS-SHEET 2- R. C. M. HASTINGS.

TELEPHONE SYSTEM.

APPLICAIION FILED DEC.27, I917.

4 SHEETSSHEET 3- Reissued Apr. 27; 1920.

R. 0.1M. HASTINGS.

TELEPHONE SYSTEM.

APPLICATION FILED DEC.27.191.7.

Reissued Apr. 27,-1920. 14,848.

4 SHEETS-SHEET 4.

. [nae/Zion Rafi/flaws UNITED STATES PATENT OFFICE,-

RUBEN CHRISTOPHER MILLER I-IlXST I'N-GS, or COLUMBUS, OHIO, AssIGNoE To INTER-' NATIONAL TELEPHONE 00., or COLUMBUS, OHIO.

TELEPHONE sYsTEM specificationiof Reissued Letters Patent. Reissu'd 27,

Original application filed April 11, 1912, Serial No. 690,014. Rama; August 20,1913, sensin 735,313. Original No. 1,206,761, dated November 28, 1916. Application for reissue filed December 27, 1917,

Serial No. 209,178.

To all Evil/01W it may concern Be it known .that I, RUBEN C. M. HAS- TINGs, a citizen of the United States, residing at Columbus, inthe county of Franklin and State of Ohio, have invented certain new and useful Improvements in Telephone Systems, of which the following is a specification, reference being had therein to the accompanying drawing.

The present invention relates to improvements in telephone systems, the primary object of the invention being the provision of an automatic call-up or ringing device, wherein by means of the insertion of the jack plug at the exchange, a ringing device will be automatically aetuated at the called subscribers set, the same being actuated continuously, the bell or buzzer ringing by intervals until the receiver at such called subscribers set is removed from the hook,

or until the jack plug is taken down, the removal of the receiver from the hook or the taking down of the jack plug opening the bell circuit and cutting out the ringing circuit.

A further object of the present invention is the provision of an automatic ringing de vice, which will employ a simple form of alarm, such as a low resistance electric bell or buzzer, and whereby the coils of the magnet therein in all of the various subscribers sets will be of small resistance so that a predetermined battery force will properly actuate such alarm, said battery being furnished from the battery used in the instrument called.

r still further object of the invention is the provision of a means whereby the automatic ringing device will be energized by means of the introduction of a jack plug into a socket at the exchange, the introduction of such jack plug operating a selecting device in the various subscribers sets to throw in line the selected called subscribers set and actuate the alarm therein, while the ringing devices in the various other subscribers sets will be cut out as well as their complete sets, the present apparatus being especially designed for use in connection with the regular telephone system as now installed, either with a series circuit or a loop circuit, or it may be used in connection with a selecting key and the system as illustrated 1n m U. S. Letters 'Pat'entNfo. 1,061,285,

dated May 13, 1913, reissued Sept. 28 1915,

N 0. 13,989, covering a selective system of telephony.

Briefly stated the present invention will have a battery for operation that can be connected to a switch at the jack socket on single circuits, or to a selecting key on party line circuits, where this switch is controlled by the jack plug. In order that the ringing device will give an intermittent and not a steady ring, a slight change is made in the controlling of the bell clapper, as will later appear. In the present apparatus" it is desired that the instrument upon the line, shall be shunted or locked out of the circuit when not in use, but the same can be either locked orunlocked at all times as maybe desirable. With the foregoing'and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed can be made within the scope of what is claimed without departing from the spirit of the'invention.

In'the drawings: Figure 1 is a diagrammatic View illustratingthe present invention as applied to the exchange and a single subscribers set in an ordinary loop circuit without the employment of a selecting key.

Fig. 2 is a similar view showing the apparatus used in connection with the present invention when a selecting key is employed on party line circuits. j

Fig. 3 is a front elevation of the receiver lock mechanism. and the automatic ringer actuating mechanism, the parts being in normal position. v

Fig; 4 is a similar View with the parts in the position they assume when the selected or called subscriber is placed in line but after the party called has removed the receiver from the hook, the automatic ringer circuit then being open.

Fig. 5 is an enlarged detail view of one of the circuit connections in the automatic ringer circuit of each subscribers set.

Fig. 3.

Fig. 7 is a section taken on l1ne 7-7 of ig. 8 is a detail elevation of the call-up alarm especially designed for operatlon 111 the present system.

Fig. 9 is a section on line 9-9 of Fig. 8.

Figs. 10 and 11 are detail views of the jack plug with the automatic callup alarm attachment thereon.

In order to fully understand the present invention, the diagram of Fig. 1 will first be described in general, while the diagram of Fig. 2 will be taken up in its order directly after the description of the diagram of Fig. 1.

Referring to the drawings, E designates the exchange, and S one of the subscribers sets, the two line wire L and Lconstituting a loop circuit connecting the exchange to the ,subscribers sets, while in the exchange is the usual jack plug J and the calling jack plug J. At the exchange there is located the calling jack socket Land the answering jack socket 1*, these being of usual structure for the reception of the respective jack plugs before described.

Disposed in operable relation to the ack socket 1 is a switch or spring contact arm 2 carrying the abutment 3 which is normally held in the position as shown in Fig. 1, by means of the limiting means 4, the outer free end of the spring contact 2 being normally in contact with the point 5 connected to the conductors 6 and 7 through the jack plug to the line L, the spring contact 2 being connected to the line wire L, when the jack plug is in the socket and completed through the usual cord. During the inserting of the calling jack plug in the calling jack socket 1, the projection of the spring contact 2 is momentarily engaged thereby and moved so that the free end thereof will engage the contact point 8, disengaging from the contact point 5. This action will throw an impulse into the line through the conductors 9, and 10, battery B, conductor 11, conductor 7, the calling jack J and socket 1 and the line L, and as the spring contact 2 is connected to the line L, the battery 13 is thrown into the line as is the usual practice in calling with loop circuits. The two conductors 11 and 12 connect the answering jack socket 1" to the line wire L and L, respectively. v

The subscribers sets each constitute the branch conductor 13, which is led into and connected to the receiver hook 14 which normally when the receiver R is upon the hook is held downwardly and in contactwith the contact 15, which in turn is connected to the conductor 16, the hinges 17 and 18 of the usual cabinet or caslng for the call-up ductors 19, 20 and 21 completing such cir cuit and the loop and practically constituting with the conductor 13, a shunt from the line wire L. The magneto M is bridged across the conductors 19 and 21 through the usual armature shunt, so that if desired the magneto may be used for calling purposes only, when the subscriber is calling the exchange. This may be connected in any Well known manner and is here shown, so that the transmission current will pass through the conductor 20, the line of least resistance.

Connected to the line wire L is a conductor 23 which has connected therein the electromagnet 24, the conductor 25 leading from said electromagnet to the line wire L. Thus it will be seen that the throwing of the batteries 13 into the line wires L and L will energize the 'electromagnet 24, the purpose of which will presently appear. Also shunted from the line wire L is a conductor 26, which leads into and is connected to a spring plate 27, whose point 28 normally engages the spring plate 29, said spring plate 29 being connected through the me dium of a conductor 30 to the line wire L and bridged across beyond the main connection of the subscribers set to said line wire L, these shunt circuits forming means to shunt the transmitter and receiver from the line, as will presently appear. The armature 31 of the electromagnet 24 controls the two pawls 32 and 33, one of which is the operating pawl, while the other is a retrograde preventing or arresting pawl for the respective ratchet wheels 35 and 36, the spring 34 normally holding the respective pawls 32 and 33 in the position as shown in Fig. 3. These ratchets 35 and 36 are keyed upon to operate the shaft 37 which carries the two disks 38 and 39 The disk 38 is provided with a plurality of peripheral radially disposed pins 40, said pins being disposed in the path to engage the respective spring terminals or arms 41 and 42, said pairs of spring terminals being so disposed and arranged that contacts 41 and 42 are normally open, being closed as will later appear. The disk 38 is also provided with the pins 40 which are disposed in the path, at the proper time, as will later appear, to close the normally open contact terminal 43 and 44.

Leading from the spring terminal 43 to the battery 47 are the conductors 45 and 46, while leading from the opposite side of the battery is a conductor 48 connected to the call-up alarm or buzzer 100. The other side of the buzzer or alarm 100 is connected by a conductor 49 to the upper spring contact 50, which is disposed to be normally in contact with the spring contact 51, which is connected to a conductor 52 which leads to the pivoted contact 44, whereby it either one of 'with the contact points 42.

the pins 40 engage the pivoted. contact 44, the circuit is closed to actuate the buzzer or alarm 100.

Connected to the contact arm 41 is a con ductor 53, which is also connected to the electromagnet 54, and a conductor 55 leads from said electromagnet and is connected to the battery 47 the circuit being completed through the conductors 46 and 56 The purpose of this circuit is to energize the electromagnet 54 which will operate the receiver hook releasing pawl 87, the detail structure of which will appear later.

hen the receiver hook 14 is raised after the substation has been called, the two contact points 57 and 58 are bridged so as to complete a circuit through the conductor 59, induction coil 60, conductor 61, transmitter T, conductor 62, battery 47, conductor 63, spring contacts 65 and 64, which are normally held open when the receiver is upon the hook, but automatically closed upon the rise of the hook as will later appear, said circuit. being completed through the conduc tor 66 with the point 5'7. This circuit connects to the line, the transmitter T, so that a talking circuit is completed with the subscribers set to the lines L, L.

A vertically movable weight 67 is disposed to normally rest upon and close the contacts 50-151, and open the contacts 64- G5, the weight 6'? being provided with the lug 68 for actuating the contact 64 to separate it from the contact 65 as clearly shown in Fig. 5. This structure is clearly set forth in diagram in Fig. 1.

In Fig. 2, constituting the diagram showing the employment of a selecting key K in lieu of the usual method of calling, and especially where the number of party lines are shown connected as in the aforementioned patent, the subscribers set is identical with that heretofore described, the only difference being at the exchange. In the exchange E are located a calling and answering jack plug J, J, respectively, the calling jack socket 1' and the answering jack socket 1. In this instance, the spring contacts 2, 6 and 9, are dispensed with and in lieu thereof are placed the respective normally closed spring contacts ab, and jlc which are opened by the insertion of the respective jack plugs in the sockets 1 and 1 respectively.

Assuming that the substation has signaled the exchange E, by once raising and lowering the receiver hook and then by operating the magneto M in the usual way, the contacts 27-29 being then open and the receiver hook being down, the exchange opcrator inserts the answering plug in the socket 1" and thus opens the contacts c-J). The selecting key is then manipulated as set forth in my Patent No. 1,061,286, dated May 13, 1913, and the various shafts 37 of all substations are rotated, the uncalled substations being shunted from the line, while the contacts 43 and 44, are closed by its pins 40, so that the call-up alarm 100 is energized. The elevation of the receiver R in the called substation elevates the weight 67 from the contacts 59 and 51, so that the callup alarm circuit is open at this point, and the alarm is deenergized.

The selecting contacts 60, 60 61 and 61 are disposed to be actuated by the selecting key mechanism and operate to throw the batteries 13 upon the lines L, L, and properly actuate the shaft 37 so as to rotate the disks 38 and 39, to effect the placing into the talking circuit of the selected and called subscribers instruments and the shunting therefrom of the uncalled subscribers.

In order that the battery B will not be diverted from the lines L-L, when it is desired to actuate the electromagnets 24 of the system and thus simultaneously actuate the shafts 37, the contacts 6()60 are provided. The contacts 6O6O are opened when the contacts 61 -61 are closed, and vice versa. The circuit, when the contacts 61-61 are closed, is as follows: the battery B the conductor .9, the contact 61- -61, the conductors r and the line L to the substation, the conductor 25, the electromagnet 24, the conductors 23, 22, 21, 20 and 16, the contact 15, the receiver hook 14, the conductors 13 and L, and the conductor 0. The contacts 6060 in being opened, open the exchange signal S at the conductors pp.

Shunt and Z0070 out dem'ce.-0ne of the lock out or shunt devices on plate 200 is located in each subscribers set, and carries the pivoted lever 71, which has its outer free end connected at all times to the receiver hook 14 through rod 70, so that the lifting of the receiver book will also lift the lever 83, which is pivotally supported by means of the pin 72 to the plate 200. Carried by the lever 71 near the lower edge thereof is a frame 73 in which is pivoted the arm 74, whose hooked end 75 normally proj ects below the lever 83 and abuts the plate 200, the spring 76 normally holding the same in this position, and as clearly shown in Fig. 7. The lever 83 is provided with the shoulder 77 which is disposed in the path of to be abutted by the free end 78 of the bell crank lever 79, which is pivoted at 79 to the plate 200 and is provided with the flat spring 80 which is disposed to have its free end engaged at all times by the pins 81 of the disk 39, said pins actuating the lever 79 to move the end 78 into and out of engagement with the shoulder 77 of the lever 83. This lever 83 is further provided with the downwardly projecting terminal 82 which is disposed to engage the free end of the contact 28, so that when the parts are in the position as shown in Fig. 3, the contacts 27 and 28 will be closed, but when moved to the position as shown in Fig. 4, the receiver hook having been raised the hooked terminal 82 will move the contact 28 downwardly and separate the same from the contact 27, thus opening the circuit at that point. Pivoted upon the same pin 72 is the lever 83 which carries a pin 84 which projects through the curved slot 85 of plate 200 and carries the weight 67 as before described.

Assuming the parts to be in the position as shown in Fig. 3, and the receiver is removed from the hook 14, the hook rises, pulling the link 70 so as to raise the lever 71 and through the hooked arm 74 will simultaneously lift the lever 83, thus lifting the weight 67 so as to permit the opening of contact arms 50,51, stopping'the alarm, and closing the contact arms 64, 65, and as the hook bridges the contacts 57-58, the transmitter and receiver are in the usual manner connected to the lines LL. The liftingof the lever 83, will elevate the pin 84 and weight 67 and thus permit the opening of the contacts 50 and 51. This opens the circuit to the bell 100. The trigger 87 not being affected by the magnet 54, is in the path to engage the free end of the lever 83, and thus lock it elevated, as shown in Fig. 4, and during the conversation. IVhen the'shaft 37 was moved to selecting position the pin 40 stopped just short of engaging the open contacts" 4142, so that after the completion of the conversation should either of the parties leave the receiver oitthe hook, the removal of the plug from the socket will cause the pin 40 to be moved and close the contacts 4142 so that the magnet 54 is energized. This action will cause the armature trigger 87 to be moved toward the magnet 54 so that the pawl 88 is drawn from engagement with the lever 83. The lever 83 will then fall by gravity permitting the closing of contacts 27-29 to shunt the telephone set from the circuit. Weight 67 has also fallen closing the ring ing circuit at 50 and '51, and opening the contacts and 64 in the battery circuit. In order to release the lever 83 automatically, during the movement of the lever 71 upwardly, the plate 89 carrying'the arm 90 is provided and carries the wedge-shaped piece 91 which is disposed to engage the inner sideof the arm 74 and move the hook 75 outwardly to release the lever 83 and permit the weight 67 thereof to move by gravity to the position asshown in 3 if the magnet 54 is energized so that the catch 87 is withdrawn. In the position as shown in Fig. 3,-the contacts 41 and 42are opened so'that the electromagnet 54 will be deenergized but as soon as theshaft 37 has been rotated a distance equal'to one-half of the distaneebetweenthe pins 40, the contact at 41 and 42 will remain broken by reason of the fact that the pins 40 are omitted from the first half step position. This permits any subscriber on the line to take down his receiver and converse with the exchange after the exchange operator has stepped the shafts 37 a proper number of steps, dependingupon the particular substation, and the pivoted contact 44 will be engaged by a pin 40 and moved into engagement with the contact point 43, thus deenergizing the electromagnet 54 and closing the circuit at 43 44 to ring the alarm 100, the weight 67 being down and in'it's lowermost position so that the contacts 50 and 51 are closed and the contacts 64, 65 open. This action takes place, as shown in diagram in Fig. 1, (with mechanism in position as shown in Fig. 4), when the calling plugis being placed within one of the calling jack sockets 1 and momentarily moves the contact 2 from point 5 to point 8, whereas under normal conditions, with the point 5 engaged by the contact '2, the device will assume the position as shown in Fig. 3. i

The pins 40 are so disposed that when the shaft 37 has been further revolved in calling a subscriber in all uncalled sets, the contacts 41 and 42 are closed and thus the circuit with the battery 47, to energize the electromagnet 54, will be as follows: the battery 47, the conductors 46 and 56, the contacts 41 and 42, the conductor 53, the electromagnet 54 and the conductor 55. Should the receiver be off the hook 14 in any of the uncalled subscribers sets, the energization of the electroma'gnets will attract the armature catch 87, and the lever 88 will fall and permit the closure of the shunt contacts 27 and 29 so that such uncalled substation will be shunted from the line. In all of the uncalled substations, where thereceiver is upon the hook, the lever 83 is held down and the shunt contacts 27-and 29 are closed. In the calling and called substations, the contacts 41 and 42 are open, as one' pin 40 is omitted at the position in which pin 40 engages the contacts 43-44 for a called substation, and the circuit to the electromagnet 54 is open, so thatlthe raising of the hook 14 will carry with it the lever83, as indicated in Fig. 4, and the contact 29 will be separated from the contact 27, placing the shunt at the called and calling substations open with the substations properly connected to the line. At the same time that the called substation was connected either by the jack plug, as in Fig; 1, or the selecting key K, as in Fig. 2, the proper pin 40 closed the contacts 43 and 44 and thus closed the local call-up alarm circuit to energize the call-up alarm 100, which remains energized until the called subscriber removes the receiver and the hook 14 is raised: Such action will lift the weight 67 and open the contacts 50 and 51 and thus the local circuit to the call-up alarm 100. The subscriber by placing the receiver upon the hook cannot depress the hook due to the fact that the spring 80 of the catch 79 is seated between the teeth of the ratchet 35 so as to place this catch 79 in engagement with. the shoulder :27 to hold the lever 83 against movement. As the operator actuates the plug or the selecting key, the shaft 37 is rotated and the spring. 80 engages the teeth of the ratchet 35 to release the catch 79 and consequently the lever 83. During this action the contacts 2729 close. The pins 40 are so disposed as to when a substation is selected the contacts 43 and 44 are engaged and closed, whereas in other positions the same are open due to the disengagement of its respective pin 40'.

Ringer aZarm.-In Figs. 8 and 9 is shown the detail structure of the preferred form of ringer alarm used with this apparatus, the

same comprising a plate 92 having the electromagnets 93 which are connected to the respective wires 48 and 49 of the subscribers sets, said plate 92 also carrying the rotatable stud 94 having keyed thereon a sleeve 95 which carries the large ratchet wheel 96 and the bell or other audible signal means 97. This bell is provided with a plurality of cut away portions 98 in line with the clapper 104, so that where the device is used on a party line although all of the electromagnets 93 may be energized, only that solid portion in line with the clapper 104 will be afl'ected.

The armature 99 is disposed to be actuatec by the electromagnet 93 and carries near its outer end a sleeve 101 to which is pivoted a pawl 10?. actuated by the spring 103 and normally held in engagement with the teeth of the ratchet 96, so that the actuation of the armature will impart the desired lifting movement to the ratchet wheel 96 and thus rotate the bell 97 to bring the cut away portion 98 or solid portion thereof into alinement with the clapper 104.

The clapper 104 is made in the form of a tube provided with elongated diametrically disposed slots 105 in which is slidably mounted the pin 106 carried, upon the extreme end of the armature 99, the slots permitting a slight movement of the pin 106 therein without affecting the tubular casing of the clapper 104. In order to produce a desired vibrating movement to the clapper 104, the two springs 107 are disposed within the casing, one of the springs being opposed to the sealed end 108 of the clapper casing while the other is opposed to the removable and adjusting plug 109 at the other end of the casing. The springs are connected to the pin 106 and thus normally hold the pin seated within the central. portion of the respective slots 105.

As all of the respective coils or electro circuit magnets 93 of the various subscribers sets are of low tension winding, it is evident that a low voltage current may be employed for operating the same thus dispensing with the costly devices which are in vogue and permittingthe employment oi? the usual form of electromagnets where the electric bells or buzzers are employed. It is also evident that these coils normally are actuated by the battery used by the telephone and that by reason of the fact that these bells are actuated by a mechanism in each individual subscribers set, it is evident that the ringing key of the switch board with its necessary connection is dispensed with.

By the use of the call-up alarm herein set forth, it will be seen that the work of the operator at theexchange is lessened and that by reason of the fact that the selection of the subscriber due to the insertion of the calling jack plug will immediately connect the call-up alarm moving the alarm mechanism continuously and ringing the bell or buzzer, by intervals, until the receiver is removed from the hook of said called sub scribers set or until the jack plug is taken down. This will insure the necessary and automatic actuation of the calling-up feature in each subscribers set and thus dispense with the work placed upon the exchange in connecting the called to the calling subscriber and actuating the ringer alarm until the called subscriber replies. It is also evident that this form of buzzer and lock out device may be connected to any telcphone system now in use and dispense with the usual ringer at the exchange and its various connections, or that the device may be used in connection with the selecting key and system as shown in applicants patent before mentioned.

Operations-Referring to .Fig. 1 and assuming the parts to be in the position as .therein shown and that the operator has re ceived a signal that a party-is desiring to use the circuit, the jack plug is inserted in the usual manner, moving into contact with the abutment 4 and thus moving the spring contact Q from engagement with the point 5 to the point 8. This action will open .the line circuit and simultaneously throw in the storage battery B, located at the we change. The contacts 2 and 5 are only open as the jack plug is passing the points 3, 4 so as to permit the storage battery in the line to operate the electromagnet 24 in the various subscribers sets. This action, energizing the electromagnet 24, will operate the pawls 32, 33, so as to rotate the shafts 37 one-half the distance between two pins 40. This action will open the contact points 41, 42 and close contact points 43, 44. The closing of the contacts 43, 44, the receiver being-on the hook and the weight 67 down so as to close the contacts 50 and 51 and open the contacts 64, 65, will connectthe ringer alarm 100-to the batteries 47 as heretofore described and thus cause the ringing of the alarm at the desired called "subscribers set which will continue ringing until the receiver R is raised from the hook 14 or until the jack plug is taken down. The lifting of the receiver from the hook will permit the hook to rise and through the contacts 57, 58 will connect the receiver and transmitter into theline, opening the contact points 50", 51 in the circuit to the bell 100 and closing the points 64, sothat the parties may now communicate. Should the called party have the receiver off the hook, when being vcalled, 'the levers 71 and 83 will be raised and the trigger 87 will have engaged its pawl 88 with the lever 83, thus holding the lever 83 raised;'"b ut as previously described, the removalof the jack plug causing" the energization of the magnet 54 dueto the pin'41' c'losing .contacts 41%42 and thus "permit ther elease of the 'lever83. Asthe hook 7 5 of thearm 74, due

to the engagement of th e arm 74 with the arm 90, has been held out of engagement with the lever 8f3,the lever 83 is thus tree to fall by 'gravityunder the influence of the weight 67 ,when the .magn et54 was energized, andassume its lowermost position.

The weight '67 thus closes the contacts 50 51, and opens contacts 64, 5 so that the battery circuit willtbe opened until the receiver hook is again a'd jus ted, thus saving the battery permitting the alarm 100 to be me position to be actuated, should the party be 'sele'cted .from' the exchange, such selectiontron 1 the exchange closing contacts 43 44, and "closing thecircuit ineluding the alarm i100 and contacts 504 51. Should any of the receivers in the various substations be off the hoolrsaand even should the levers 8 3 andweights 6,? be elevated and held elevated by the p awls 88, it .is evident that the *firial movement of the disk 38, will causeithe pins" 40 to close 'theil respective contacts 41 -42, so that'theina gnet hei will b'e"'en'ergi'zed and" the various triggers 8.7

will 'b'eattracted 'tb' release the,l'ever wfh'ich liie tb'the weights 67 will fall and closethe contacts 50 51 and open fthe constation in' prop'er' positionfltobehrung from the e' ichangef evefi though the receiver remainbfi the hlx'ik. 'VVhen thecontrolmechanisni b'fthe substationisin the pcsitionas 'sh 'w'n-"i Eig.' 3,"that is, with the 5 contacts 27 "29 closed, 'the "substation "is shunted from the line through theconductor the contacts '27 29jarid the mediator 30, but

' whenthe substation is cjallii'ig central, or is free to respond" after "being selected and calledftherofitacts27 29 are o peiied as in Figjf'4 by the 'f receiver hook 14 and conses uently'gthe lever Fromthe threi going it will be seen that the pins 40 control the contacts 41' and 42 while the pins 40 control the contacts 43 and 44 and that change station .and a plurality of substa- 't1ons, each substat on hav ng 'a circuit 11') eluding a' local batter a ca-ll'alarm in the circuit, and means controlled by the insertion 'andreinoval of a. calling plug in its socketat the exchange station to close and open the call alarm circuit.

2. A telephone system, iaving an exchange station and a plurality of substations, each substationhaving a local battery circuit, a' tran'smitter and a receiver, anothercircuit including the battery of the local battery circuit, a call alarm in the last circuit, and means controlled by the insertion and removal offla calling plug in its socket at the exchange station to close and open the call alarm circuit.

3. A telephone "system, having an exchange station and a plurality of substa tions, each substation having a circuit in-- cluding, a battery, a receiver hook forming one closure for said circuit, a call alarm in the battery circuit, said circuitbeing open when the hook is raised, and means con trolled by the insertion and removal of a calling plug in its socket, at the exchange station "to close' and open the call alarm circuit.

4. Ina telephone system, the combina' tion of an exchange and a plurality of substations,each of said substations including receiver, a local battery circuit, a transmitter in said circuit, a call-up alarm con the connection with the call-up alarmand ,battery controlled by the receiver in the called substation, whereby the removal of the receiver opens such switch and the call-up alarm circuit.

5. In a telephone system, the combination of an exchange and a plurality oi subscribers sets-of instruments, an electromagnetically controlled circuit making device disposed in each 'subscribers set and connected to'the line, a call-up alarm in each set, an individual .circ'uit connected there- .with and controlledby said device, said circuit being normally open, a calling jack circuit to each set located in the exchange,

and means in operable relation thereto actuated upon the insertion of the calling plug Within the socket to actuate the device in the called subscribers set to close the call-up circuit and actuate the alarm.

6. In a telephone system, the combina tion of an exchange and a plurality of subscribers sets of instruments, a transmitter and a receiver in each set, an electromagnetically controlled circuit making device disposed in each subscribers set and connccted to the line, a call up alarm in each set, an individual circuit connected therewith and controlled by said device, said circuit be' g normally open, a calling jack circuit for each set located in the exchange means in operable relation thereto actuated upon the insertion of the calling plug Within the socket to actuate the device in the called subscribers set to close the call-up alarm circuit and actuate the alarm, and means controlled by the receiver hook in each subscribers for opening the call-up alarm circuit .nd. connecting the transmitter and receiver to the line.

7. In a telephone system, the combination of an exchange and aplurality of subscribers sets of instruments connected electrically for the transmission of intelligence; said subscribers sets each having means controlled from the exchange for shuntin a E;

the set from the line, a local battery, a transmitter and a receiver, a circuit including the local battery controlled by the shunting means, a call-up alarm in the last circuit; and means for calling the called subscribers set in the exchange and for auto maticallv closing the call-up alarm circuit or tie called subscnaer s set.

8. In a telephone system, the combmation of an exchange and a plurality of SdlOSCIlbers sets of instruments connected for the transmission of intelligence; said subscribers sets each having means controlled from' the exchange for shunting the set from the line, a local. battery, a circuit including the local battery, a transmitter and a receiver, another circuit connected to said battery, a receiver hook controlled switch in said last circuit controlled by the receiver, it being clo d when the receiver is upon the hook, a call-up alarm in the last circuit, and a second switch in the last circuit controlled by the shunting means; and means for connecting the calling subscribers set and simultaneously,actuating the shunting means in the called subscribers set to close the second switch. of the call-up alarm circuit to energize the alarm.

9. In a telephone system, the combination of an exchange id a plurality of subscribers sets of instrurnemsg said subscribers sets each including a transmitter and a receiver and having means controlled from the exchange for shunting the setsjrom the line, and a call-up alarm connected to the local battery of the set means for calling the called subscribers set in the exchange and for automatically connecting the callup alarm With the battery of the called subscribers set, and means controlled by the eceiver hook due to the removal of the receiver therefrom for disconnecting the callup alarm circuit and for connecting the transmitter and receiver to the line.

10. In a telephone system, the combination of an exchange station and a plurality of sub-stations connected electrically, each sub-station having a transmitter, a receiver, a receiver hook, a local battery, a call-up alarm for connection With the local battery, means controlled from the exchange for shunting the sets from the line and for antomatically connecting the call up alarm With the battery, and means controlled by the receiver hook due to the removal of the receiver therefrom for opening the call-up alarm circuit.

11. In a telephone system, the combination of an exchange and a plurality of subscribers sets connected for the transmission of intelligence, an electromagnetically controlled means disposed in each subscribers set and connected to the line, said means being operated due to the introduction and removal of a calling jack plug in a calling socket at the exchange, a call-up alarm in each subscribers set, a circuit including the alarm and the battery of each set, a receiver lock, a pair of contacts normally open and disposed in operable relation in said circuit, and another circuit including said battery and controlled by said electro-magnetically controlled means for actuating the receiver lock,

12. A telephone system having an exchange station and a substation, a call-up alarm located in the substation, means controlled by the insertion and removal of the calling plug in its socket at the exchange station to close and open the call-up alarm circuit, a receiver in the substation, a re ceiver hook in the substation, and means controlled by the receiver hook whereby the call-up alarm may be energized Whether the receiver hook is up or down.

13. A telephone system having an exchange station and a substation, a callup alarm located in the substation, means controlled by the insertion and removal of the calling plug in' its socket at the exchange station to close and open the call-up alarm circuit, a receiver in the substation, a receiver hook in the substation, and means controlled by the receiver hook whereby the call-up alarm may be energized Whether the receiver is upon or oil the hook.

14. A telephone system having an exchange station and a substation, a receiver hook in the sub-station, a source of electri cuit in the substation, a switch therein concal energy in the sub-station,;a call-up alarm in the substation, and means controlled. from the exchange for connecting the call-up alarm and the source of electrical energy regardless of the position of the receiver hook.

15. A telephone system having an ex change station and a substation, a call-up alarm in the substation, a receiver hook in the substation, means controlled at the exchange station for energizing the call-up alarm whether the receiver hook is up or down, and means controlled by the movement of the receiver hook for deenergizing the call-up alarm.

16. A telephone system, including an exchange and a substation, said substation having a step-bystep device mounted therein and controlledv by the insertion or removal of'the jack plug at the exchange station, a call-up alarm circuit in the substation, and aswitch therein controlled by the step-by-step device, to be alternately opened and closed.

17. A telephone system including an exchange and a substation, said substation having a receiver hook, a step-by-step device mounted in the substation and controlled by the insertion or removal of the jack plug at the exchange station, a call-up alarm cirtrolled by the step-by-step device to be alternately opened and closed, and a second switch in said circuit automatically controlled by the receiver hook whereby the call-up alarm may be energized when the first switch is closed regardless of the position of the hook.

18. A telephone system including an exchange and a substation, said substation having a receiver hook, a step-by-step device mounted in the substation and controlled by the insertion or removal of the jack plug at the exchange station, a call-up alarm circuit in the substation, a switch therein controlled by the step-by-step device to be alternately opened-and closed, a second-switch in said circuit automatically controlled by the receiver hook whereby the call-up alarm may be energized when the first switch is closed regardless of the position of the hook, and means controlled by the receiver hook 0nd switch toopen the circuit to deenergize the-call-up alarm.

' 19. A telephone system including an exchange station and a substation, an electrically actuated step-by-step device mounted in the substation, said device being con- .trolled by the insertion and removal of the calling plug in its socket at the exchange station, a call-up alarm circuit in the subduring its movement for controlling the secstep-by-step device whereby the insertion v and withdrawal of the calling plug causes the energization and denergization of the call-up alarm, a second switch in said circuit, means controlled by the receiver hook for causing the opening or closing of the second switch, and means for causing the closure of the second switch regardless of whether the receiver hook is up or down. Columbus, Ohio, November 12th, 1917. In testimony whereof I aflix my signature.

RUBEN CHRISTOPHER MILLER HASTINGS.

Witnesses to Mr. Hastings signature.

WILLIAM JOB, M. E. ANDREWS. 

